/*
 * @Author: your name
 * @Date: 2021-01-13 16:21:06
 * @LastEditTime: 2021-01-14 09:42:41
 * @LastEditors: Please set LastEditors
 * @Description: In User Settings Edit
 * @FilePath: \myReposCode\Thread\waitFor.cpp
 */
#include <iostream>
#include <atomic>
#include <condition_variable>
#include <thread>
#include <chrono>
using namespace std::chrono_literals;
 
std::condition_variable cv;
std::mutex cv_m;
int i;
 
void waits(int idx)
{
    std::unique_lock<std::mutex> lk(cv_m);
    
    if(cv.wait_for(lk, idx*100ms, []{return i == 1;})) 
        std::cerr << "Thread " << idx << " finished waiting. i == " << i << '\n';
    else
        std::cerr << "Thread " << idx << " timed out. i == " << i << '\n';
}
 
void signals()
{
    std::this_thread::sleep_for(120ms);
    std::cerr << "Notifying...\n";
    cv.notify_all();
    std::this_thread::sleep_for(100ms);
    {
        std::lock_guard<std::mutex> lk(cv_m);
        i = 1;
    }
    std::cerr << "Notifying again...\n";
    cv.notify_all();
}
 
int main()
{
    std::thread t1(waits, 1), t2(waits, 2), t3(waits, 3), t4(signals);
    t1.join(); t2.join(), t3.join(), t4.join();

    return 0;
}